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CHAPTER 5 NDA-24300
Page 310
Issue 1
FAULT REPAIR PROCEDURES
Speech System Fault Faults related to speech. Section 5.2, Speech Path System
Fault - Fault Related to Speech
Dial tone is not heard. Section 5.3, Speech Path System
Fault - When Dial Tone (DT)
Cannot Be Heard
STBY side is faulty. Section 5.4, Speech Path System
Fault - STBY Side Has Become
Faulty
Control System Fault Fault occurs occasionally at the ACT side. Section 6.2, Control System Fault -
Fault Occurs Intermittently
STBY side is faulty. Section 6.3, Control System Fault -
STBY Side Is Faulty
Alarm Indication Fault No fault indication is made on the Alarm Indicator
Panel.
Section 7.2, Fault of Alarm
Indicating Panel
Fault is not detected. Section 7.3, Fault That Cannot Be
Detected
Power Supply Fault Fuse for RGU/-48V has blown. Section 8.2, Fuse Blown Fault
The circuit breaker of PWR supply is off. Section 8.3, Circuit Breaker OFF
Fault in PWR Supply
Alarm lamp on the PWR supply is lit. Section 8.4, Fault of Alarm Lamps
on PWR Supply
Fan Unit Fault • Fan are not activated even if the temperature has risen
higher than a predetermined degree.
• Fans are not activated even if the FAN START switch
is set to AUTO position.
Section 9.2, Fan Unit Fault
Tone Fault Tone is distorted. Section 10.2, Tone Fault
System Down Fault Cause for the fault cannot be identified. Section 11.1, When Cause for Fault
Cannot Be Identified
The faulty circuit card can be detected. Section 11.2, When Faulty Circuit
Cards Can Be Assumed From
System Message
CCIS Line Fault • A Specific CCH/CCT card is faulty. When the signal
transmission line is a digital line, transmission/re-
ceiving of control signals cannot be performed.
• When the signal transmission line is an analog line,
transmission/receiving of control signals cannot be
performed.
Section 12.3, Specific CCH/CCT
Card Is Faulty and
Section 12.4, Fault of CCH, DTI
and Related Flat Cable
Table 5-1 Fault Repair Procedure Quick Reference (Continued)
FAULTY ITEM FAULTY SITUATION REFERENCE SECTION